Elementary Level Algebra :part 1 ( in Hindi)

Sayak ghosh

a year ago

sir x^40+1/x^40 is not square of any no. I mean, as x^4 + 1/x^4 is square of x^2 + 1/x^2 . why ans. of x^40+1/x^40 is taken as -1

Sayak ghosh

a year ago

I'm getting the result as -1 but after multiplying (x^5 +1/x^5) X (x^8 +1/x^8). Is this method, which I followed is right ?